For the reaction, 2 A + B → products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 m o l L - 1 s - 1 to 2.4 m o l L - 1 s - 1 . When the concentration of A alone is doubled, the rate increased from 0.3 m o l L - 1 s - 1 to 0.6 m o l L - 1 s - 1 . Which one of the following statements is correct?

Order of the reaction with respect to B is 2

Total order of the reaction is 4

Order of the reaction with respect to A is 2

Order of the reaction with respect to B is 1

MEDIUM

Earn 100

The rate constant for a chemical reaction has units $L m o l^{- 1} s^{- 1}$ ,order of the reaction will be

50% studentsanswered this correctly

Important Questions on Chemical Kinetics

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The rate constant for a first order reaction is

7 .0 \times 10^{- 4} s^{- 1} .

If initial concentration of the reactant is

0.080 M

, what is the half-life of the reaction?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

A + 2 B \to C

, the rate equation for the reaction is given as

Rate

= k [A] [B]

If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is:

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

Mechanism of a hypothetical reaction

X_{2} + Y_{2} \to 2 XY

is given below:

(i)

X_{2} \to X + X (fast)

(ii)

X + Y_{2} ⇌ XY + Y (slow)

(iii)

X + Y \to XY (fast)

The overall order of the reaction will be

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

For an elementary chemical reaction, $A_{2} ⇄_{k_{- 1}}^{k_{1}} 2 A$ , the expression for $\frac{d [A]}{dt}$ is:

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

In the reaction,

P + Q \to R + S

the time taken for

75 %

reaction of

P

is twice the time taken for

50 %

reaction of

P

. The concentration of

Q

varies with reaction time as shown in the figure.The overall order of the reaction is:

Question Image

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The rate constant for the first order reaction is

60 s^{- 1} .

How much time will it take to reduce the concentration of the reactant to

\frac{1}{16} t h

value?

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

For a first order reaction

A (g) \to 2 B (g) + C (g)

at constant volume and 300 K, the total pressure at the beginning

(t = 0)

and at time are

p_{0} and p_{t}

, respectively. Initially, only A is present with concentration

{[A]}_{0}

, and

t_{\frac{1}{3}}

is the time required for the partial pressure of A to reach

1 / 3^{rd}

of its initial value. The correct option(s) is (are)
(Assume that all these gases behave as ideal gases)

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The rate constant of the reaction

A ⟶ B

0.6 \times 10^{- 3}

mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

A first-order reaction has a specific reaction rate

10^{- 2} \sec^{- 1} .

How much time will it take for

20 g

the reactant to reduce to

5 g

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

Decomposition of

X

exhibits a rate constant of

0 .05 μg / year

. How many years are required for the decomposition of

5 μg

X

into

2 .5 μg

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The half-life period of a first-order reaction is

15 minutes

. The amount of substance left after one hour will be

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

Which among the following reactions can be an example of pseudo first order reaction?

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

518^{o} C,

the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of

363 Torr

was

1 .00 Torr s^{- 1}

when

5 %

had reacted and

0 .50 Torr s^{- 1}

when 33% had reacted. The order of the reaction is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The rate law for the reaction below is given by the expression

k [A] [B]

A + B \to P r o d u c t

If the concentration of

B

is increased from

0.1 to 0.3 mol

, keeping the value of

A

0.1 mol

, the rate constant will be:

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

Decomposition of

H_{2} O_{2}

follows a first order reaction. In fifty minutes the concentration of

H_{2} O_{2}

decreases from

0.5

0.125 M

in one such decomposition. When the concentration of

H_{2} O_{2}

reaches

0.05 M

, the rate of formation of

O_{2}

will be:

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The reaction

2 N_{2} O_{5} (g) \to 4 N O_{2} (g) + O_{2} (g)

follows first order kinetics. The pressure of a vessel containing only

N_{2} O_{5}

was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

For the reaction,

2 A + B \to

products, when the concentration of

A

and

B

both were doubled, the rate of the reaction increased from

0.3 m o l L^{- 1} s^{- 1}

2.4 m o l L^{- 1} s^{- 1} .

When the concentration of

A

alone is doubled, the rate increased from

0.3 m o l L^{- 1} s^{- 1}

0.6 m o l L^{- 1} s^{- 1} .

Which one of the following statements is correct?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>The Rate Law and Rate Constant

The rate of a first-order reaction is

0.04 m o l l^{- 1} s^{- 1}

10

second and

0.03 m o l l^{- 1} s^{- 1}

20

seconds after initiation of the reaction. The half-life period of the reaction is:

The rate constant for a chemical reaction has units L mol-1s-1,order of the reaction will be

Important Questions on Chemical Kinetics

Learn and Prepare for any exam you want !

The rate constant for a chemical reaction has units $L m o l^{- 1} s^{- 1}$ ,order of the reaction will be